Turbine-pump.



F. W. KROGH.

TURBINE PUMP.

APPLICATION FILED FEB. 10. 1914.

Patented D60. 7, 1915.

2 SHEETS-SHEET 1 will/Ill V Il 34 INVENTOR.

WITNESSES.

ATTO R N EY.

COLUMBIA VLANOGRAPH c0., WASHINGTON, D. c.

F. W. KROGH.

TURBINE PUMP.

APPLICATION FILED FEB. 10. 1914. 1,163,243. Patented Dec.7,1915.

2 SHEETS-SHEET 2.

WITNESSES.

ATTORNEY.

-Cm|iMUIA PLANDGRAPH CO WASHINCITON. D. t

a j nnrr STATES Arnnr @FFIQ.

FERDINAND W. KROGH, or SAN rnAnoIseo', CALIFORNIA.

TURBINE-PUMP.

To all whom it may concern: I

Be it known that I, FERDINAND W Knoon, of San Francisco, California,have invented certain new and useful Improvements in Turbine-Pumps,whereof the following is a specification. v

, This invention relates to centrifugal pumps, more particularly to thevertical type, wherein the impeller is balanced by the equalizingpressure on both ends there. of, and also. relates to certainfeaturesdisclosed in my application filed July 17, 1913, Serial No. 779,410.

.Among the objects of this invention are to provide means forcontrolling the balaneing pressure ,on the suction side of the impeller;to construct the members subject to the greatest wear so that they maybereadlly replaced when excessive wear makes it desirable; to so designthe pump that the partssubjeeted to the greatest wear may be formed ofthe most suitable material to resist wear, while the permanent parts maybe formed of baser and more economical material. I

Other objects and advantages will appear in the accompanying two sheetsof drawings and in the description thereof.

In the drawings, Figure 1 is a vertical cross section of a centrifugalpump, having this invention incorporated therein. Figs. 2, 8 and 4illustrate modifications in the design and application of this inventionas combined in the structure of centrifugal pumps.

Construction-In detail the construction of this invention as illustratedin Fig. 1 in eludes the base 1, hermetically attached to the casing 2.The casing and base are provided with the flanges 3 and lsurrounding thelower suction opening and the upper discharge opening respectively. Thecasing supports an internally spaced chamber wall 5, preferably castintegral with the casing to which it is attached by the hollow coredstruts 6. The depending neck 7, provides a vertical bearing providedwith the bushing 8, to receive the vertical shaft 9, journaled therein.The impeller 10 is fixed to the lower end of the shaft in any suitablemanner and includes in its structure the open suction throat 11, havingimpelling planes 12, radiating therefrom in the usual manner. Theannular flange 18 extends up wardly around the periphery of theimpeller.

I The hub of the impeller is provided with the Specification of LetterslE"atent.

'01 seal its lower opening Patented'DecfiJ915.

Application filed February 10, 1914. Serial No. 817,811.

outwardly extending flange 14. The divid ng diaphragm l5 is attached tothe annular base of the wall 5; this combination forming the upperchamber 16 and the lower pressure chamber 17. The diaphragm 15 is provided with the annular depending central rim 18, leaving the annularspace or port 19 between it and the neck ,7. .Thecircumference of thediaphragm 15 is provided with the depending annular flange 20. Thisflange 20 cooperates with the flange 13, to partially seal the lowerchamber; 21, within the casing. The relative positions of these twoflanges may be varied as indicated, in ,these several modificationsillustrated. To maintain the suetionwithin the casing in operation it isnecessary to pack around the throat ll of the impeller. This isaccomplished by the bushing 22 of suitable antifriction bearing metal,fixed within the base 1 and approximating contact with the neck23 of theimpeller; whereby the inrushing liquid is forced to flow through theimpeller only.

0pemte'on The pump operates substantially as follows: These pumps areusually submerged, .or other means are provided for priming, or fillingthem with water or the liquid to be pumped; whenused in stages or.tandem the lower pump is submerged and those above discharge upwardfromone tothe other. Obviously the weight of the shaft and attachedmechanisms tends to force the impeller; downward, which tend ency iseounteraetedby the disposition of the impellerto rise in cutting throughthe liquidin which it is rotating, other forces enter into the practiceof this art, that are sufliciently well known to those skilled thereinto render superfluous a lengthy description of the necessity forbalancing the pressure on both sides of the impeller. The hydrostatichead or pressure in the casing 21 leaks between the flanges 13 and 20into the chamber 17, until the pressure therein equals the pressure inthe casing, restoring the normal tendency of the propeller to descend,which opens a space between the rim 18, and the flange 14, permittingthe escape of the pressure within the chamber 17 through the annularspace 19 into the upper chamber 16, that is open to atmospheric pressureor to the medium within which the pump is submerged through the hollowstruts 6. The tendency of the impeller to drop is counteracted by itslifting tendency in cutting through the liquid, and also by the liftingtendency of the hydrostatic head confined within the base 1, displacingthe impeller upward. The gradual accumulation and release of thepressure of the chamber 17 tends to equalize all counter forces; wherebythe impeller is caused to float in its operation, removing end thrust ineither direction. Frictional contact between the rim 18 and the flangelet, the flanges 13 and 20, and the bushing 22 and the throat 23represent the wearing parts upon which the balance pressure systemdepends and all these parts are readily removable for replacement. Thesand cap 24: overhangs the upper end of the bushing 8 to prevent theentrance of sand at this point into the main bearing of the drive shaft.

The modification in Fig. 2 shows the depending flange 20 and 13transposed, as compared in the structure illustrated in Fig. 1; theadvantage in this transposition is the attainment of greater length ofthe vanes 12*.

The modification illustrated in Fig- 3 shows a variation in thediaphragm 15 which is screwed into the neck 7 and has theopenings 19located near the periphery. These openings or ports comprise dependingtubes formed integrally with thediaphragm at the proper intervals; theopening 19 being closed by the flange 149 formed adjacent to the flange13 on the impeller.

The modification shown in Fig. 4: comprises the diaphragm 15 keyed ontothe neck 7 and provided with a depending flange 20 having the ports 19located adjacent thereto at intervals; these ports are closed by theflange 1r projecting inward from the lines 13 on the periphery of theimpeller.

Having thus described my invention, and an embodiment of it, in thefull, clear and exact terms required by law, and knowing that itcomprises novel, useful and valuable improvements in the art to which itpertains, I here state that I do not wish to be limited to the preciseconstruction and arrangement of the several parts, as herein set forth,as the same may be variously modified by a skilled mechanic withoutdeparting from the spirit of the invention.

What I claim and desire to secure by Letters Patent of the United Statesis the following, to wit:

1. A centrifugal pump including a casing having an upper chamber thereinclosed by a removable diaphragm having a central opening, a flange onthe impeller of the pump adapted to close said opening, flanges on saidimpeller and said diaphragm, cooperating to form a pressure chamber insaid impeller.

2. Centrifugal pump including a casing having an upper chamber therein,closed by a removable diaphragm having a central opening, a flange onthe impeller of the pump surrounding the shaft thereof adapted to closesaid central opening and forming thereby a pressure chamber in saidimpeller.

3. A centrifugal pump including a casing having an upper chambertherein, closed by a removable diaphragm having a central opening, aflange on the impeller of the pump surrounding the shaft thereof adaptedto close said central opening, oppositely projecting flanges on saidimpeller and said diaphragm, cooperating to form a pressure chamber insaid impeller.

In testimony that I claim the foregoing I have hereto set my hand this20th day of January 1914, in the presence of witnesses.

FERDINAND W. KROGH.

Witnesses L. M. 'WILLIAMs, MJMARKEL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

